The difference here is that he made all his own parts (except the rail). Throwbar notwithstanding, you have to admire the willingness to eschew off-the-shelf parts.
Yes, it is extremely well done, tho in this case you still do see some of the traditional compromises such as the PCB ties (with gaps) and the notched base of the stock rails at the points. BTW, the new P:87 throwbars look pretty impressive:

I'm interested in the frog, and how that is all held together, since it looks like there aren't to many PCB ties under that area. I'm also interested if that will safely handle code 88 wheels.
Ed